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[Aural fullness and endolymphatic hydrops].

E Gossow-Müller-Hohenstein1, A Hirschfelder, G Scholz

  • 1Hals-Nasen-Ohrenklinik der Charité, Campus Virchow-Klinikum, Humboldt-Universität zu Berlin.

Laryngo- Rhino- Otologie
|March 8, 2003
PubMed
Summary
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Aural fullness may indicate endolymphatic hydrops. Measuring low-frequency modulated distortion-product otoacoustic emissions (DPOAEs) can help diagnose this condition and monitor treatment effectiveness.

Area of Science:

  • Otoacoustic Emissions
  • Auditory Physiology
  • Inner Ear Disorders

Background:

  • Aural fullness is a subjective symptom that may indicate endolymphatic hydrops.
  • Endolymphatic hydrops involves fluid imbalance in the inner ear.

Purpose of the Study:

  • To investigate if aural fullness can be an indicator of endolymphatic hydrops.
  • To assess the utility of low-frequency modulated DPOAEs in diagnosing endolymphatic hydrops.

Main Methods:

  • Low-frequency modulated DPOAEs were recorded in patients with Menière's disease, aural fullness, and normal hearing adults.
  • The modulation depth of DPOAEs was analyzed in relation to the phase of a suppressor tone.
  • Mechanical stiffening of the basilar membrane, characteristic of endolymphatic hydrops, was hypothesized to reduce DPOAE modulation.

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Main Results:

  • Patients with Menière's disease and aural fullness showed significantly lower DPOAE modulation depth compared to the control group.
  • No significant difference in modulation depth was observed between patients with and without vertigo.
  • Reduced modulation depth suggests mechanical stiffening of the cochlear partition.

Conclusions:

  • Reduced DPOAE modulation depth is a potential indicator of endolymphatic hydrops.
  • Aural fullness in patients may be associated with cochlear hydrops.
  • Low-frequency modulated DPOAEs offer a novel method for diagnosing and monitoring endolymphatic hydrops and evaluating therapeutic outcomes.